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US 4,228,368 AGranted
Polarity correcting circuit
OwnerRobert A. Orbaninventor
Life of this patent
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Abstract
A circuit for controlling the polarity of an asymmetrical waveform, such as a typical audio waveform, is described. The circuit provides smooth polarity switching with substantially no audible switching sound. The smooth switching results from switching each frequency of the audio signal at a different time. The circuit is particularly useful in a peak-limiting apparatus such as those often used in AM broadcasting.
Claims7
A circuit for controlling the polarity of an asymmetrical input audio signal comprising:
- a switching means for selectively providing an inverted or non-inverted audio output signal, the input of said switching means coupled to receive said input audio signal, said switching means providing a transition to said inverted or non-inverted output audio signal such that each frequency of said audio signal is changed to an inverted or non-inverted state at a different time;
- detection means for sensing said polarity;
- control means for controlling said switching means, said control means coupled to said detection means and said switching means;
- whereby smooth polarity switching is provided for said audio signal.
1 more element
Dependencies are inferred from the claim text.